Quantum Hall effect metrology system

Quantum Hall effect metrology system

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Credit: ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY/SCIENCE PHOTO LIBRARY

Caption: Quantum Hall effect metrology system. Apparatus (right) being used for a measuring system based on the quantum Hall effect (QHE). This system is used to determine standards for measuring electrical resistance. The equipment is a small table-top cryogen-free quantum Hall system based on a graphene-on-silicon-carbide system. It contains a small 5-Tesla superconducting magnet at a temperature of around 2.5 Kelvin. Photographed in 2014, at the National Physical Laboratory, Teddington, UK.

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